Definition of chamber noun from the Oxford Advanced Learner's Dictionary

Oxford3000

chamber

noun
ˈtʃeɪmbə(r)
 
; ˈtʃeɪmbər
 
 
1 [countable] a hall in a public building that is used for formal meetingsThe members left the council chamber.the Senate/House chamber see also Chamber of Commerce2 [countable + singular or plural verb] one of the parts of a parliamentthe Lower/Upper Chamber(= in Britain, the House of Commons/House of Lords)the Chamber of Deputies in the Italian parliamentUnder Senate rules, the chamber must vote on the bill by this Friday.3 [countable] (in compounds) a room used for the particular purpose that is mentioneda burial chamberDivers transfer from the water to a decompression chamber. see also gas chamber4 [countable] a space in the body, in a plant or in a machine, which is separated from the restthe chambers of the heartthe rocket's combustion chamberthe chamber of a gun (= the part that holds the bullets)5 [countable] a space under the ground which is almost completely closed on all sidesThey found themselves in a vast underground chamber.6 [countable] (old use) a bedroom or private roomLady Eleanor was found dead in her chamber.